Submission #15,068

2025-02-12 09:10:07

cpp17

Accepted 50/50

48ms

8092 KiB

#include <bits/stdc++.h>
using namespace std;
int MOD=20210108;

int main() {
	int n;
    cin >>n;
    vector<long long> dp(n+1,0);
    dp[0]=1;
    for(int i=1;i<=n;i++){
        dp[i]=(dp[i]+dp[i-1]*2)%MOD;
        if(i>=3){
            dp[i]=(dp[i]+dp[i-3]*2)%MOD;
        }
    }
    cout <<dp[n];
}

	Sum	Test	Verdict		Time	Memory
base	50/50
		1	Accepted	0/0	1ms	316 KiB
		2	Accepted	0/0	1ms	316 KiB
		3	Accepted	3/3	1ms	316 KiB
		4	Accepted	3/3	1ms	316 KiB
		5	Accepted	4/4	1ms	316 KiB
		6	Accepted	4/4	1ms	316 KiB
		7	Accepted	4/4	48ms	8092 KiB
		8	Accepted	4/4	7ms	1332 KiB
		9	Accepted	4/4	1ms	320 KiB
		10	Accepted	4/4	1ms	404 KiB
		11	Accepted	4/4	10ms	1852 KiB
		12	Accepted	4/4	48ms	7988 KiB
		13	Accepted	4/4	43ms	7220 KiB
		14	Accepted	4/4	17ms	3052 KiB
		15	Accepted	2/2	1ms	316 KiB
		16	Accepted	2/2	1ms	316 KiB